[Bug 55500] [sna gen4 w/a] corrupt rendering (including wrong rendering of characters and flickering on redraw)

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=55500

--- Comment #161 from Zdenek Kabelac <zdenek.kabelac at gmail.com> ---
(In reply to comment #160)
> Typical, it appeared stable through my firefox testing, but if you try
> reverting b7565a26401e283df94b68019e8093f8104428f4, I expect the corruptions
> to disappear again.

Yep - correct revert of this commit make  MAX_VERTEX 1 again producing correct
rendering - even thought it's again noticable slower - thus now it's clear why
I've considered it usable with MAX 1 before (in my comment 155).

So yep - revert & MAX 1 works again - but it's quite slow.

Is it now any better to deduce which operation is make such bad memory
interaction ?

It seems like the 'synchronization' is really needed only at very certain
moments - where the GPU is producing memory corruption error on the screen -
but how to catch in which moment ?

I'm still suspecting some memory layout of those memory object - since when I
see corruption - it usually it specific places (i.e. edit of this firefox input
widget and just only certain characters at certain positions are render with
errors)

How can I try to increasing memory alignment ?
(i.e. each object only at 16KB boundary?)

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